Abstract
Single molecules of sodium lignosulfonate (NaLS) were prepared and their aggregation behavior was studied as a function of temperature. The molecular dispersity of the NaLS solutions were confirmed by dynamic light scattering (DLS), and the aggregation behavior was studied by DLS and static light scattering (SLS), fluorescence spectrometry (FS), and atomic force microscopy (AFM). It was demonstrated that NaLS molecules started to aggregate above a critical temperature and the aggregation behavior was related to their spherical microgel conformation and hydrophobic interaction. During the DLS measurement, when NaLS was dissolved in 1.2 mol·l-1 NaCl aqueous solution and then filtered with 0.45 μm syringe filter, the slow-mode diffusion (smD) corresponded to the polyelectrolyte effect and the original aggregates disappeared and the fast-mode diffusion (fmD) corresponded to the monomolecular NaLS (not yet aggregated) in the solution. When the temperature of the NaLS solution was raised to 38°C, the disappeared smD in DLS analysis appeared again, indicating that NaLS molecules started to form new aggregates. Due to the aggregation at 38°C, molecular weight (Mw) obtained from the SLS had a sharp increase, intensity ratio (I1/I3) of pyrene in FS suddenly decreased, and the adsorption of NaLS on a solid substrate and the corresponding roughness of the surface increased significantly.
Acknowledgments
This work was financially supported by National Basic Research Program of China (973 Program) 2012CB215302, and the National Natural Science Foundation of China (21374032, 21176096).
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© 2014 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Lignin chemistry and topochemistry during kraft delignification of Eucalyptus globulus genotypes with contrasting pulpwood characteristics
- Rapid functionalisation of cellulose-based materials using a mixture containing laccase activated lauryl gallate and sulfonated lignin
- Aggregation of sodium lignosulfonate above a critical temperature
- Impact of iron(II) and oxygen on degradation of oak – modeling of the Vasa wood
- Morphological, thermal, and structural aspects of dried and redispersed nanofibrillated cellulose (NFC)
- Effects of recovered wood on the formaldehyde release of particleboards
- Oxalic acid production and metal removal during fungal degradation of CCA-treated wood in nutrient culture
- Analysis of cold temperature effect on stress wave velocity in green wood
- Finite element modeling and experimental validation of radio frequency heating (RFH) of curved laminated wood-based panels
- Anti-termitic potential of heartwood and bark extract and chemical compounds isolated from Madhuca utilis Ridl. H. J. Lam and Neobalanocarpus heimii King P. S. Ashton
- Effects of thermal modification on wood ultrastructure analyzed with crystallographic texture
- Short Notes
- Potential contribution of anion exclusion to hydroxide penetration in green liquor-modified kraft pulping
- Improving the weathering on larch wood samples by electron beam irradiation (EBI)
- Effect of plasma treatment on cell-wall adhesion of urea-formaldehyde resin revealed by nanoindentation
- Imaging hyphal growth of Physisporinus vitreus in Norway spruce wood by means of confocal laser scanning microscopy (CLSM)
- Meetings
- Meetings
Articles in the same Issue
- Frontmatter
- Original Articles
- Lignin chemistry and topochemistry during kraft delignification of Eucalyptus globulus genotypes with contrasting pulpwood characteristics
- Rapid functionalisation of cellulose-based materials using a mixture containing laccase activated lauryl gallate and sulfonated lignin
- Aggregation of sodium lignosulfonate above a critical temperature
- Impact of iron(II) and oxygen on degradation of oak – modeling of the Vasa wood
- Morphological, thermal, and structural aspects of dried and redispersed nanofibrillated cellulose (NFC)
- Effects of recovered wood on the formaldehyde release of particleboards
- Oxalic acid production and metal removal during fungal degradation of CCA-treated wood in nutrient culture
- Analysis of cold temperature effect on stress wave velocity in green wood
- Finite element modeling and experimental validation of radio frequency heating (RFH) of curved laminated wood-based panels
- Anti-termitic potential of heartwood and bark extract and chemical compounds isolated from Madhuca utilis Ridl. H. J. Lam and Neobalanocarpus heimii King P. S. Ashton
- Effects of thermal modification on wood ultrastructure analyzed with crystallographic texture
- Short Notes
- Potential contribution of anion exclusion to hydroxide penetration in green liquor-modified kraft pulping
- Improving the weathering on larch wood samples by electron beam irradiation (EBI)
- Effect of plasma treatment on cell-wall adhesion of urea-formaldehyde resin revealed by nanoindentation
- Imaging hyphal growth of Physisporinus vitreus in Norway spruce wood by means of confocal laser scanning microscopy (CLSM)
- Meetings
- Meetings